NativeCompute Timing: Use real, not user time

User time is unreliable for `native_compute`.

Also output time spent in conversion to native code, just in case that
is ever slow.

Note that this also removes spurious newlines in the output.

Fixes #11962

3 files changed, 15 insertions, 9 deletions

diff --git a/doc/changelog/04-tactics/11023-nativecompute-timing.rst b/doc/changelog/04-tactics/11023-nativecompute-timing.rst
deleted file mode 100644
index e8cdfcca21..0000000000
--- a/doc/changelog/04-tactics/11023-nativecompute-timing.rst
+++ /dev/null
@@ -1,7 +0,0 @@
-- The :flag:`NativeCompute Timing` flag causes calls to
-  :tacn:`native_compute` (as well as kernel calls to the native
-  compiler) to emit separate timing information about compilation,
-  execution, and reification.  It replaces the timing information
-  previously emitted when the `-debug` flag was set, and allows more
-  fine-grained timing of the native compiler (`#11023
-  <https://github.com/coq/coq/pull/11023>`_, by Jason Gross).
diff --git a/doc/changelog/04-tactics/11025-nativecompute-timing.rst b/doc/changelog/04-tactics/11025-nativecompute-timing.rst
new file mode 100644
index 0000000000..cb77457c31
--- /dev/null
+++ b/doc/changelog/04-tactics/11025-nativecompute-timing.rst
@@ -0,0 +1,11 @@
+- **Changed:** The :flag:`NativeCompute Timing` flag causes calls to
+  :tacn:`native_compute` (as well as kernel calls to the native
+  compiler) to emit separate timing information about conversion to
+  native code, compilation, execution, and reification.  It replaces
+  the timing information previously emitted when the `-debug` flag was
+  set, and allows more fine-grained timing of the native compiler
+  (`#11025 <https://github.com/coq/coq/pull/11025>`_, by Jason Gross).
+  Additionally, the timing information now uses real time rather than
+  user time (Fixes `#11962
+  <https://github.com/coq/coq/issues/11962>`_, `#11963
+  <https://github.com/coq/coq/pull/11963>`_, by Jason Gross)
diff --git a/doc/sphinx/proof-engine/tactics.rst b/doc/sphinx/proof-engine/tactics.rst
index 6a280b74c2..7da453b7af 100644
--- a/doc/sphinx/proof-engine/tactics.rst
+++ b/doc/sphinx/proof-engine/tactics.rst
@@ -3134,8 +3134,10 @@ the conversion in hypotheses :n:`{+ @ident}`.
    .. flag:: NativeCompute Timing
 
       This flag causes all calls to the native compiler to print
-      timing information for the compilation, execution, and
-      reification phases of native compilation.
+      timing information for the conversion to native code,
+      compilation, execution, and reification phases of native
+      compilation.  Timing is printed in units of seconds of
+      wall-clock time.
 
    .. flag:: NativeCompute Profiling